Have a 2004 S500 W220 and recently had the tpms wheel sensors replaced with Huf 0055422418 units. Everything works fine but the instrument panel control system display shows each tire's pressure in bars instead of psi. How do you change the display to psi?

moved to W220 fourm...
i assume there's menu to change it?

Thanks for the reply. I can't find any menu in the control system for this change. 2004 S-class Operator's Manual page 285 says vehicles produced up to October 2003 have a control system menu for changing the unit of measure and shows a picture of the tire pressure display in PSI. Manual page 287-288 is for vehicles produced after October 2003 and doesn't mention anything about changing the units of measure, but page 288 still shows a picture of the tire pressure display in PSI. I can always multiply Bars by 14.5 to get PSI but it seems like there should be a way to have the control system tire pressure display show PSI.

Are you in KM? Try putting it into Miles mode in the settings menu.

Thanks for the reply. Car has always been in the Miles mode. Tried changing from Miles to KM and then back to Miles but tire pressure display is still in Bars. Manufacture date for car was November 2003 which makes me think this problem might be related to the October 2003 W220 control system tire pressure display change (see my comments above about page 285-288 in Operator's Manual). I'm speculating that Mercedes removed the Bars to PSI measurement choice feature for W220 control systems made after October 2003 and you're stuck with whatever the display shows. But then, why does Manual page 288 (for post October 2003 cars) have a picture with the display shown in PSI?

My '05 owner's manual shows this (click on image to enlarge):

Thanks for the reply. Yes, you are correct. 2005 and 2006 are OK. 2005 S-class Operator's Manual page 308 says you can select the unit of measure and page 162-164 show how to do it. Same for 2006 S-class Operator's Manual page 309 and 162-164. 2003 and 2004 seem to have a conflict in the Operator's Manual. 2003 manual page 274 says you can select the unit of measure with reference to the Control System menus and page 275 shows a picture of the display in PSI, but page 148-150 (Control System submenu for Instrument Panel) doesn't show anything about it. The 2004 manual is bit more confusing since page 285 says October 2003 and older cars can select the unit of measure with reference to the Control System menus, page 287-288 doesn't show this choice for October 2003 and newer cars, page 288 shows a picture of the display in PSI but page 153-155 (Control System submenu for Instrument Panel) doesn't show anything about it.

If anyone out there has a 2003 or 2004 S-class with working TPMS, please let me know if your Control System TPMS display shows Bars only, PSI only or have you figured out how to change the unit of measure.

I referred to my electronic copy of the '04 owner's manual in response to your post at 7 above; most puzzling, indeed.

Likely, as you said, there was a change, either in the TPMS computer (controller) or in the display software. Irrespective of the manual, to which you have obviously paid close attention, are you able to locate a menu in your car using the '05 instruction above? I ask because the COMAND electronics in the later production '04 were shared with the '05 and '06 (though the phone systems were quite different), and I had hoped perhaps the menus might also be shared.

If you're like me, you have already done a number of TPMS system resets. If you haven't you might try several. And the last alternative MIGHT be to deflate your tires, then re-inflate to at least 37 psi (the pressure needed to activate many brands of TPMS sensors). Once that is done, try a reset; and if that works out, deflate your tires to the proper pressures.

Beyond that, I'm out of options short of having the dealer try to reset the reading using DAS.